2. 外语
  3. The nature of light is not wholly known, but it is generally believed to be matter, as in its(1)______, it obeys the laws(2)____

The nature of light is not wholly known, but it is generally believed to be matter, as in its(1)______, it obeys the laws(2)____

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问题     The nature of light is not wholly known, but it is generally believed to be matter, as in its(1)______, it obeys the laws(2)______matter. So closely is it connected with heat and electricity that there can be (3)______ doubt of their all being(4)______ different modifications of the same substance. The effects of light(5)______ other bodies and how light is affected by them(6)______ some important principles.
    Rays of light are reflected from one surface to(7)______. It is by this reflection of light that objects are(8)______ visible. However, unless light falls directly(9) ______the eye they are invisible, and are not(10)______felt until after a certain series of operations upon the various coverings of the eye. Smooth and(11)______surfaces reflect light most powerfully, and send to the eye the images of the objects (12)______ the light proceeded before reflection. Glass would be of no use to us as a mirror, were it not first(13)______on one side, interrupting the rays in their(14)______from the glass into the air. The reason why trees, rocks and animals are not all mirrors is that their surfaces are(15)______, and rays of light reflected from such a surface are(16)______in every direction. Stand before a mirror and your image is formed and appears to be as far(17)______the glass as you are before it. Rays of light(18) ______reflected at the same(19) ______at which they fall upon a mirror, two persons can stand in (20)______ position that each can see the image of the other without seeing his own.
(4)
选项 A、but
B、still
C、hardly
D、narrowly
答案A
解析 副词辨析题。[A]but作为副词，意思与only相似，表示“仅仅”，用在空格中符合原文的逻辑含义，因此为正确答案。[B]still的意思是“仍旧”，一般用于表示在做出让步、妥协或是采取措施等之后，情况依旧，没有变化，不符合原句的逻辑关系，排除；[C]hardly表示“几乎不”，表示否定含义，也不符合原句的意思和逻辑关系，因此排除；[D]narrowly的意思是“勉强地”，不符合句意，故排除。
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